Jefferson County's estimated 2025 population is 35,922 with a growth rate of 2.46% in the past year according to the most recent United States census data. Jefferson County is the 12th largest county in Idaho. The 2010 population was 26,222 and has seen a growth of 36.99% since that time.
Data after 2023 is projected based on recent change
The racial composition of Jefferson County includes 88.29% White, 4.44% other race, and smaller percentages for Native American, Black or African American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Other race
Native American
Black or African American
Asian
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 28,459 | 88.29% |
| Two or more races | 2,080 | 6.45% |
| Other race | 1,432 | 4.44% |
| Native American | 197 | 0.61% |
| Black or African American | 40 | 0.12% |
| Asian | 21 | 0.07% |
| Native Hawaiian or Pacific Islander | 5 | 0.02% |
Married
Widowed
Divorced
Separated
Never Married
Jefferson County's average per capita income is $46,155. Household income levels show a median of $82,952. The poverty rate stands at 9.24%.
Name | Median | Mean |
|---|---|---|
| Married Families | $94,333 | - |
| Families | $89,672 | $103,571 |
| Households | $82,952 | $95,822 |
| Non Families | $40,318 | $57,101 |
Average Income
Median Household Income
Poverty Rate
